Eren Yeager's Wife's Manga

In an empire where women are forbidden from learning the ancient language, Luna cross-dresses as "Lou" to work as a translator. While punishable by death, what haunts her is what's in her future self's diary from a strange library in her dreams. Hoping as a translator to change her circumstances and dismal fate, her main client happens to be her cousin's fiance, Duke Rothenbern, who gets drugged with a potent love potion and needs her "aid" detoxifying it.

When Linari, who was executed alongside her family due to the tyrant crown prince’s plot, opened her eyes, she returned three years into the past. She vowed to change their fates, doing so by crossdressing in order to assist Fortis Academy in her younger twin brother, Liam's stead. However, the crossdressed Linari caught the eyes of Perseus, the quartet led by the crown prince. An isekai academy love story begins... one where she can’t ever be caught!

After the third time succumbing to the same rare illness in a BL novel, Robelia Flor couldn't take dying the same way anymore. So, special measures were taken.

She disguised herself as a servant named Robel, to serve a sick young master whose very breath, riddled with spiritual power, could heal her. But serving said individual was not easy…

In order to survive, I kissed the protagonist and we became life partners. But I can’t believe that the ‘kind’ male lead in the original novel was all an act! We were bound together by an intertwined fate, sharing the same wounds, pain, life and death. Plus, is contact for the sake of symbiosis necessary? With his mask uncovered, he was readily cruel to me. Overworked, grueling demands… Why can’t I be with another man?